Correct me if I'm wrong, but isn't the purpose of these for them to not be an eyesore among the background? Like, all they are meant to do is pass as a weird tree at a single glance from like a car window.
Yes, that is what is supposed to happen, but in this case I think they really made a point of doing the absolute bare minimum required to install this one....
I'm pretty sure it wasn't a woosh. It's really common to build "fake" buildings to hide equipment. The OP says it already existed, but all the windows look like typical hidden building fake windows. There's a wall behind all of them. You can find these buildings all over, hiding things like electric substations, oil jacks, subway infrastructure, and all kinds of other things.
We've got a few in that style where I live, and they are all among redwood trees. Ours are modeled after blue spruce, which doesn't grow around here and in the middle of a bunch of warm/yellow green redwoods, they look like cookie monsters with antennae.